Castrol ST90 is a monograde SAE90 gear oil formulated with high quality mineral oils.    Castrol ST90 is fortified with anti-oxidant and anti-wear additives to ensure that the oil is able to withstand the oxidising conditions which will be present in the gearbox during service.

Castrol ST90 is suitable for the lubrication of most types of gear including helical, spur, bevel and worm but most not be used for hypoid gears which require extreme pressure lubricants.
Castrol ST90 is not suitable for applications where MIL-L-2105A/B/C are specified.

• High quality mineral oil
• Withstands oxidisation